CN105282722B - It selects for network with the system and method for diverting call session - Google Patents
It selects for network with the system and method for diverting call session Download PDFInfo
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- CN105282722B CN105282722B CN201510283864.3A CN201510283864A CN105282722B CN 105282722 B CN105282722 B CN 105282722B CN 201510283864 A CN201510283864 A CN 201510283864A CN 105282722 B CN105282722 B CN 105282722B
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- 238000000034 method Methods 0.000 title claims abstract description 113
- 230000004044 response Effects 0.000 claims abstract description 58
- 230000008569 process Effects 0.000 claims description 46
- 230000005540 biological transmission Effects 0.000 claims description 22
- 230000007774 longterm Effects 0.000 claims description 12
- 230000000977 initiatory effect Effects 0.000 claims description 2
- 230000003993 interaction Effects 0.000 claims 1
- 230000011664 signaling Effects 0.000 description 18
- 238000010586 diagram Methods 0.000 description 14
- 230000006870 function Effects 0.000 description 8
- 238000004891 communication Methods 0.000 description 5
- 230000001413 cellular effect Effects 0.000 description 4
- 230000006399 behavior Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 238000005314 correlation function Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 210000004556 brain Anatomy 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/16—Communication-related supplementary services, e.g. call-transfer or call-hold
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0066—Transmission or use of information for re-establishing the radio link of control information between different types of networks in order to establish a new radio link in the target network
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
- H04W36/00224—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/06—Reselecting a communication resource in the serving access point
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/10—Reselecting an access point controller
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
- H04W36/305—Handover due to radio link failure
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/18—Selecting a network or a communication service
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Telephone Function (AREA)
- Telephonic Communication Services (AREA)
Abstract
The invention discloses select for network with the system and method for diverting call session.It provides and is executed by website in the method for the diverting call session between different access networks.The described method includes: the invitation that audio call is added is transmitted to the second website by the first radio access network (RAN) by the first website；The invitation is received by second website；Response to the invitation is generated by second website；Determine that the response cannot be successfully transmitted to first website by second website；It is associated with the 2nd RAN by second website；Second website message associated with the 2nd RAN is used to indicate by second website generation；The message is transmitted to first website by second website；Transmit the invitation that the audio call is added again by first website；The invitation is received by the 2nd RAN by second website；And the audio call is established between first website and second website.
Description
Technical field
The present invention relates to select for network with the system and method for diverting call session.
Background technique
First website can be configured to wirelessly communicate with the second website.In particular, the first website can pass through nothing
Line communication network sends data to the second website and receives data from the second website.First website and the second website can be used
Network using various different applications to be communicated.For example, the first website can be MO mobile origination for audio call
(MO) website, and the second website can be called (MT) website for mobile station.Audio call can execute in a variety of different ways.Example
Such as, when MO website or MT website are connected to 2G or 3G network, circuit-switched voice call can be used to execute audio call.?
In another example, when MO website or MT website are connected to long term evolution (LTE) network, LTE voice (VoLTE) can be used to exhale
Call execution audio call.
When executing VoLTE calling, MO website and MT website can be performed and initially set up process.During initially setting up,
Invitation can be transmitted to MT website to participate in VoLTE calling by MO website.It is called as VoLTE, invites and transmitted by LTE network.
MT website can receive also by LTE network and invite and provide response.MT website is prevented to make a response invitation however, may be present
A variety of causes.For example, MT website may know that in the presence of the incoming call from MO website, but cannot be provided by LTE network
Response to invitation.In this case, calling may fail to establish, this is excessively poor end user's experience, especially because
The user of MT website may have been received instruction and manually make a response (for example, prompt) to invitation.In addition, being used for
The additional trial of VoLTE calling can continue failure, until MT website can be by LTE network transmission response.
Summary of the invention
According to one embodiment, a kind of method is disclosed, comprising: the first radio access network is passed through by the first website
(RAN) invitation that audio call is added is transmitted to the second website；The invitation is received by second website；By described second
Website generates the response to the invitation；Determine that the response cannot be successfully transmitted to the first stop by second website
Point；It is associated with the 2nd RAN by second website；By second website generation be used to indicate second website with institute
State the 2nd associated message of RAN；The message is transmitted to first website by second website；By the first stop
Point transmits the invitation that the audio call is added again；As second website by being invited described in the 2nd RAN reception
Please；And the audio call is established between first website and second website.
According to another embodiment, a kind of method is disclosed, comprising: at the first website: being directed to from the reception of the second website
The invitation of the establishment process of audio call, second website are connected to long term evolution radio access network (LTE-RAN), institute
It states the first website and is configured with LTE voice (VoLTE) execution audio call；Determine that first website cannot use
The LTE-RAN will be transmitted to second website to the response of the invitation；First website is connected to traditional RAN,
Wherein the tradition RAN executes audio call as circuit-switched call；Switching is generated when being connected to the tradition RAN
Message, the handover request include first website instruction associated with the tradition RAN；The handover request is passed
Transport to second website；The invitation that the establishment process for audio call is received from second website, wherein deferring to
The tradition RAN executes the establishment process；And the voice with second website is executed via the tradition RAN
Calling.
According to another embodiment, a kind of method is disclosed, comprising: at the first website: by building for audio call
The invitation of vertical process is transmitted to the second website, and first website is connected to long term evolution radio access network (LTE-RAN),
First website is configured with LTE voice (VoLTE) and executes the audio call；It receives and switches from second website
Message, the handover request include second website instruction associated with traditional RAN, wherein the tradition RAN is by language
Sound calling is executed as circuit-switched call；The invitation is transmitted to second website again；The voice is executed to exhale
The establishment process cried；And the audio call of execution and second website.
According to another embodiment, a kind of system is disclosed, comprising: be connected to long term evolution radio access network
(LTE-RAN) the first website；And second website, wherein first website is configured as: will building for audio call
The invitation of vertical process is transmitted to the second website；Handover request is received from second website, the handover request includes described the
Two websites instruction associated with traditional RAN, wherein the tradition RAN holds audio call as circuit-switched call
Row；The invitation is transmitted to second website again；Execute the establishment process of the audio call；And it uses
LTE voice (VoLTE) executes the audio call with second website；And wherein, second website is configured as:
The invitation of the establishment process for audio call is received from the first website；It is described to determine that second website cannot use
LTE-RAN will be transmitted to first website to the response of the invitation；First website is connected to traditional RAN；Even
Handover request is generated when being connected to the tradition RAN, the handover request includes that second website is related to the tradition RAN
The instruction of connection；The handover request is transmitted to first website；Building for audio call is received from first website
The invitation of vertical process, wherein deferring to the tradition RAN to execute the establishment process；And it is held via the tradition RAN
The capable audio call with first website.
Detailed description of the invention
Fig. 1 shows the exemplary network arrangement that audio call is executed for website.
Fig. 2 shows be configured as executing the exemplary website of audio call.
Fig. 3, which is shown, to be shown for executing network selection with call session is transferred to the second network from first network first
Example property signaling diagram.
Fig. 4, which is shown, to be shown for executing network selection with call session is transferred to the second network from first network second
Example property signaling diagram.
Fig. 5, which is shown, passes through the first example of first or second network execution audio call for being called website by mobile station
Property method.
Fig. 6 shows the second example for executing audio call by first or second network by MO mobile origination website
Property method.
Specific embodiment
Exemplary embodiment describes the method executed by two websites.This method comprises: passing through first by the first website
The invitation that audio call is added is transmitted to the second website by radio access network (RAN)；The invitation is received by the second website；By
Second website generates the response to the invitation；Determine that the response cannot be successfully transmitted to the first website by the second website；By
Two websites are associated with the 2nd RAN；Second website message associated with the 2nd RAN is used to indicate by the generation of the second website；
Message is transmitted to the first website by the second website；Transmit the invitation that audio call is added again by the first website；By second station
Point is received by the 2nd RAN and is invited；And audio call is established between the first website and the second website.
Exemplary embodiment further describes the method executed by the first website, this method comprises: connecing from the second website
The invitation narrowed to the establishment process of audio call, the first website are connected to long term evolution radio access network (LTE-RAN),
First website is configured with LTE voice (VoLTE) and executes audio call；Determine that the first website cannot use LTE-RAN will
Second website is transmitted to the response of invitation；First website is connected to traditional RAN, wherein tradition RAN using audio call as
Circuit-switched call executes；Generate handover request when being connected to traditional RAN, the handover request include the first website with
Traditional associated instruction of RAN；Handover request is transmitted to the second website；The foundation for being directed to audio call is received from the second website
The invitation of process, wherein deferring to traditional RAN to execute establishment process；And the voice with the second website is executed via traditional RAN
Calling.
Exemplary embodiment also describes the method executed by the first website, this method comprises: by for audio call
The invitation of establishment process is transmitted to the second website, and the first website is connected to long term evolution radio access network (LTE-RAN), the
One website is configured with LTE voice (VoLTE) and executes audio call；Handover request, the switching are received from the second website
Message includes the instruction associated with traditional RAN of second station point, wherein tradition RAN is using audio call as circuit-switched call
To execute；Invitation is transmitted to the second website again；Execute the establishment process of audio call；And the language of execution and the second website
Sound calling.
With reference to being described below and relevant drawings are further appreciated that exemplary embodiment, wherein similar element have it is identical
Reference label.Exemplary embodiment is related to selecting for network with the system and method for diverting call session.In particular, institute
It states transfer and is related to the establishment process for being used to establish audio call of audio call.More particularly, MO mobile origination (MO) website
Can invite mobile station be called (MT) website carry out audio call, wherein both MO website and MT website be connected to long term evolution without
Line is electrically accessed network (LTE-RAN).LTE voice (VoLTE) call session can be used to execute audio call for MO website and MT website.
Therefore, data grouping is transmitted between MO website and MT website during establishment process by LTE-RAN, is exhaled with establishing voice
It cries.If MT website cannot transmit the response to the invitation for audio call by LTE-RAN, MT website can propose message
It is supplied to MO website, message instruction is selecting possible more reliable heterogeneous networks such as conventional wireless to be electrically accessed network (RAN)
(for example, 2G network, 3G network etc.).
Fig. 1 shows the exemplary network arrangement 100 for executing audio call to MT website 110 for MO website 105.Specifically
Say that MO website 105 can wirelessly be communicated with MT website 110 to execute audio call in ground.Network arrangement 100 may include LTE-
RAN 115, tradition RAN 120 and cellular core network 125.Accoding to exemplary embodiment, MO website 105 and MT website 110 can
Utilize both LTE-RAN 115 and tradition RAN 120.As described above, LTE-RAN 115 can be base when being related to audio call
Network standard based on full IP in sheet, and tradition RAN 120 can utilize circuit switched protocol by private communication channel.Although ginseng
It examines LTE-RAN and tradition RAN (such as 2G or 3G network) describes exemplary embodiment, it is not required that network is that these are accurate
The network of type.For example, first network can be any kind of packet-switched networks or IP-based network, and traditional
RAN can be any kind of circuit-switched network.For example, any network 115,120 can be for such as according to IEEE 802.11a/b/
The WiFi network that g/n/ac is defined.WiFi network 105 can further indicate that any kind of WiFi network, such as individual's WiFi net
Network, family's WiFi network, enterprise WiFi network, hot spot etc..In some cases, WiFi network can be described as WLAN
(WLAN).Network 115,120 may also include any network of referred to as WLAN.Therefore, when describe in the exemplary embodiment MO station
When point 105 and MT website 115 are connected to LTE-RAN 115 or tradition RAN 120, MO website 105 and MT website 110 can connect on the contrary
It is connected to WiFi network.
MO website 105 and MT website 110 can indicate to execute any electronic equipment of audio call.When being connected to LTE-RAN
When 115, MO website 105 and MT website 110 can be considered as that there is required hardware and software configuration to execute VoLTE calling.It can
Audio call is established between MO website 105 and MT website 110 using various different applications.When MO website or MT website connect
When being connected to traditional RAN 120, website 105,110 usable circuit-switched voice calls participate in audio call.About voice transfer,
Traditional RAN 120 is usually using private communication channel come carry voice calls, but this is not necessary condition.
VoLTE calling is related to transmitting by LTE-RAN 115 using voice service as data flow.VoLTE calling can root
Executed according to the network standard for being substantially based on full Internet protocol (IP), without in traditional network (for example, tradition RAN
120) private communication channel used in.Therefore, it is initially setting up information used in process and is being used during VoLTE calling
All voice messagings transmitted by LTE-RAN 115 as data grouping.
VoLTE, which is called, can be used IP multimedia subsystem (IMS) 130, and the IP multimedia subsystem is with LTE-RAN's 115
The cellular core network 125 of provider is associated.IMS 130 allows to carry out multimedia visit using common IP interface.Use IMS
130, it can be attached by different agreement.In particular, VoLTE calling can be with circuit switching in the case where 130 IMS
Speech network interoperability.For example, if MO website 105 is connected to LTE-RAN 115 and to the MT for being connected to traditional RAN 120
Website 110 initiates calling, then IMS 130 is used to interconnection call between the different networks.Even if when circuit-switched network is unavailable
When, the IP interface of IMS 130 also allows for VoLTE calling to interoperate with other voice networking technologies.Therefore, for that will execute
Audio call, MO website 105 can be connected to LTE-RAN 115, it is not required that MT website 110 is connected to LTE-RAN 115,
Or vice versa.Therefore, when both MO website 105 and MT website 110 are connected to LTE-RAN 115, VoLTE calling can be by standing
Both points 105,110 execute.(or the uplink of LTE-RAN is able to use when only MO website 105 is connected to LTE-RAN 115
Both transmission and downlink transmission) when, VoLTE calling can be performed in MO website 105.However, MT website 110 may not connected
To LTE-RAN 115, so that 110 execution circuit switched voice call of MT website.By this method, it is still established via IMS 130
Audio call between MO website 105 and MT website 110.
When establishing audio call between MO website 105 and MT website 110, when what consideration tradition RAN 120 was provided covers
When cover area, traditional RAN 120 can be considered as more more reliable than LTE-RAN 115.For example, website may not have enough uplinks
Link transmission power come transmit to VoLTE calling invitation response, but can have enough uplink transmission powers come
Calling from traditional RAN120 is made a response.However, it will further be appreciated by those of ordinary skill in the art that when considering potential data transmission
When rate, LTE-RAN 115 can be better than tradition RAN 120.
If both MO website 105 and MT website 110 are connected to LTE-RAN 115, and are being connected to LTE-RAN 115
When by IMS 130 be that voice is registered, then MO website 105 and the two of MT website 115 can have same step number on LTE-RAN 115
According to and voice, thus for website 105 and 110 option is provided with execute VoLTE calling.When both MO website 105 and MT website 110
When can utilize LTE-RAN 115, consider from user perspective and network perspective, VoLTE calling can be for various reasons and excellent
In circuit-switched voice call.In fact, website can be configured to use always when website is connected to LTE-RAN115
VoLTE calls to participate in audio call.However, may be present LTE-RAN 115 may not be utilized by one of website it is various
Situation.For example, MT website 110 can be for that cannot use the uplink in LTE-RAN 115 during VoLTE call establishment process
Link transmission causes audio call to fail to establish.In another example, right if website is not registered on IMS 130
It can be dependent on LTE-RAN 115 in data transmission website, and traditional RAN 120 can be dependent on for audio call website.
Exemplary embodiment, which is provided, is transferred to traditional 120 network of RAN for call session so as in MO website 105 and MT
The seamless way of audio call is established between website 110.In particular, when MT website 110 cannot be invited to for VoLTE calling
When please make a response, handover request can be provided to MO website 105 by MT website 110, which indicates that MT website 110 cannot
Utilize LTE-RAN 115.Handover request can also indicate that traditional RAN120 is used for voice and exhaled by the plan of MT website 110 to website 105
It cries.MO website 105 can execute different behaviour for the audio call that will be established when receiving handover request from MT website 110
Make.
Fig. 2 shows be configured with VoLTE calling or circuit-switched voice call to execute the example of audio call
Property website 200.In particular, website 200 can indicate electronic equipment such as MO website 105 and MT website 110.Website 200 can be
It is configured as that any electronic component of network is added, such as portable device is (for example, cellular phone, smart phone, plate are electric
Brain, flat board mobile phone, laptop computer etc.) or fixed apparatus (for example, desktop computer).Website 200 may include processor
205, memory arrangement 210, display equipment 215, input/output (I/O) equipment 220, transceiver 225 and other component 230, it is all
Such as portable power, audio I/O equipment.
Processor 205 can be configured to execute multiple application programs of website 200.Processor 205 can be at application program
Manage device, baseband processor or their combination.When being connected to LTE-RAN 115 or tradition RAN 120 via transceiver 225,
Application program may include Web browser.Web browser can indicate the relevant application program of data.
In another example, application program may include calling appl. 235.Calling appl. 235 can indicate needle
The relevant application program of voice of audio call is executed to website 200.When website 200 is MO website 105, calling appl.
235 produce the invitation for audio call.When website 200 is MT website 110, calling appl. 235 can receive and be directed to
The invitation of audio call.Then calling appl. 235 produces the response to invitation.The establishment process of audio call is available
To establish audio call between MO website 105 and MT website 110.When a voice call is set up, calling appl. 235 can
Function associated with transmitting and receiving voice messaging is executed during audio call.It is come from for example, audio I/O equipment can receive
The raw tone of user, and raw tone is converted into be transmitted to the data grouping of network via transceiver 235.Specific
In example, when audio call is that VoLTE is called, voice data packet can be transmitted by LTE-RAN 115.
Calling appl. 235 may further determine that the type for the audio call that will be executed by website 200.For example, working as website
200 when being connected to LTE-RAN 115, and audio call can call for VoLTE.In another example, when website 200 is only connected to
When traditional RAN 120, audio call can be circuit-switched voice call.It should be noted that being exhaled when being connected to LTE-RAN 115
Application program 235 is made to can be configured to execute VoLTE calling always.However, describe in detail as discussed further below, it is exemplary
Embodiment provides the mode that traditional RAN 120 is used when website 200 is connected to LTE-RAN 115.
In yet another example and accoding to exemplary embodiment, application program may include network selection application program 240.
It describes in detail as discussed further below, when website 200 just undergoes the case where preventing audio call to be established, network selection is answered
The transfer of call session can be performed with program 240.In particular, when website 200 (as MT website 110) cannot use VoLTE
When calling makes a response the invitation of audio call, traditional RAN 120 can be used to establish voice for network selection application program 240
Calling.Network selection application program 240 also produces the handover request that will be transmitted to MO website 105, handover request instruction
Traditional RAN 120 is used in MT website 110.
It should be noted that calling appl. 235 and network select application program 240 as the application that is executed by processor 205
Program (for example, program) is merely exemplary.Application program 235-240 be also denoted as website 200 be independently incorporated to component or
Person can be the modular member for being coupled to website 200.
Memory arrangement 210 can be hardware component, the operation which is configured as storage and is executed by website 200
Relevant data.For example, memory arrangement 210 can store caller database associated with calling appl. 235.Calling
Person's database can be the catalogue of such as people, which has in the audio call that the correspondence website to selected people carries out by exhaling
It is the associated contact details that application program 235 uses.Memory arrangement 210 can also store other data, such as
The measured network parameter of LTE-RAN 115.Display equipment 215 can be the hardware component for being configured as showing data to user,
And I/O equipment 220 can be to be configured as receiving input from the user and export the hardware component of corresponding data.Other component
230 may include portable power (for example, battery), data acquisition equipment, for website 200 to be electrically connected to other electronic equipments
Port etc..
Fig. 3 is shown for executing network selection so that call session is transferred to traditional RAN's 120 from LTE-RAN 115
First exemplary signaling chart 300.It is used to indicate in particular, signaling diagram 300 is related to MO website 105 from the reception of MT website 110
The handover request that MT website 110 is switching to traditional RAN120 is maintained at the situation on LTE-RAN 115 later.
As shown, session invitation 305 can be transmitted to MT website 110 by MO website 105.In particular, working as audio call
When executing (for example, MO website 105 is connected to LTE-RAN 115) as VoLTE calling by MO website 105, session invitation 305 can
It is transmitted to the component (for example, enhancement mode node B (eNB)) of LTE-RAN 115.When calling is VoLTE calling, session invitation
310 can be Session initiation Protocol (SIP) invitation.Since both MO website 105 and MT website 110 are connected to LTE-RAN
115, therefore session invitation 310 is then forwarded to MT website 110 by LTE-RAN 115.It will be understood by those skilled in the art that
Additional signaling may be present in LTE-RAN 115 to ensure session invitation 310 being transmitted to MT website 110.However, signaling diagram 300
It is meant only to summarize for simplifying for signaling procedure, and each signal for being completed audio call by transmitting is not shown.
MT website 110 can be connected to LTE-RAN 115 and can decode the downlink of LTE-RAN 115, so that meeting
Words invite 310 to be received.MT website 110 is can determine when having been received by session invitation 310 including various in session invitation 310
Parameter, such as identity of MO website 105.In particular example, when receiving SIP invitation, MT website 110 can be directed to IMS
130 and be paged, and establish radio resource control (RRC) connection.MT website 110 is produced to session invitation 310
Conversational response 315 is to establish audio call.In this example, conversational response 315 is considered as not reaching LTE-RAN 115.So
And the purpose completely discussed for offer, if conversational response 315 is received by LTE-RAN 115, and it is forwarded to MO website
105, then VoLTE calling can be established between MO website 105 and MT website 110.
In addition to generating conversational response 315, the network selection application program 240 of MT website 110 is receiving session invitation
Timer 320 can be started when 310.In the first example, timer 320 can be related to continuous " asynchronous " instruction.It hereafter will more in detail
" asynchronous " instruction carefully is described.In the second example, preset timer may be selected to avoid excessively radically reselecting is
System.Therefore, which can be used as threshold value to determine when to select application program 240 to execute network selection by network.In advance
If timer can be for for example from 1 second to 3 second.
During the period of timer 320, the calling appl. 235 of MT website 110 can be attempted to ring by transmission session
315 are answered to make a response to session invitation 310, which can be in the form of sip response.However, as shown in Figure 3, MT
Website 110 may not be able to use LTE-RAN 115 that conversational response 315 is transmitted to MO website 105.May be present prevents MT website
110 are provided to conversational response 315 any number of situation of LTE-RAN 115, and some examples are provided below.
In the first example, MT website 110 can be in uplink limited situation in LTE-RAN 115, while still
Can in LTE-RAN 115 decoding downlink.Therefore MT website 110 can receive passes through LTE-RAN 115 from MO website 105
The session invitation 310 of transmission, but cannot make a response.Uplink limited situation can lead to 110 transmission session of MT website and ring
315 are answered, but conversational response 315 never arrives at the destination, i.e. LTE-RAN 115 or MO website 105.
In the second example, MT website 110 can determine radio link failure (RLF) event.RLF event can be physics
(PHY) interruption in layer.RLF event can be caused by various different situations as the skilled person will appreciate.For example, can deposit
In " asynchronous " instruction (for example, N310) of the consecutive numbers purpose from PHY layer.This happen pre-determined number (for example,
T311 after), it may be determined that RLF event.In another example, as measured Reference Signal Received Power (RSRP) or measured
When Reference Signal Received Quality (RSRQ) is lower than predetermined threshold, when physical downlink control channel (PDCCH) since power is believed
Number quality (for example, low RSRP or RSRQ) and when failing decoding, when physical down link sharing channel (PDSCH) since power is believed
Number quality and when failing decoding, etc., RLF event can be assumed to be to be occurred by website 200.In yet another example, when
When signal and interference and noise ratio (SINR) from website 200 are substantially less than the configuration of eNB, when eNB cannot be examined for PDSCH
When surveying the confirmation (ACK) from website 200 or negating ACK (NACK), etc., RLF event, which can be assumed to be, has passed through LTE-RAN
115 evolved node B (eNB) occurs.
Once timer 320 has failed, network selection application program 240 just determines that MT website 110 cannot make a response
325.For example, when situation described above appears on MT website 110 (for example, uplink limited case, RLF event etc.),
Network selects application program 240 to can determine that MT website 110 may not be able to be via LTE-RAN 115 using audio call as VoLTE
Calling is to execute.
Once having carried out the determination, the network selection application program 240 of MT website 110 can be selected better than LTE network 115
330 tradition RAN 120 are selected, for example, can determine should be by traditional RAN 120 come execution circuit for network selection application program 240
Switched voice call.Network selection application program 240 can indicate execute by traditional RAN 120 to calling appl. 235
Audio call.If calling appl. 235 is configured as using LTE-RAN 115 always when available, which can cover
Cover the configuration.Network selection application program 240 can also constructively indicate that LTE-RAN 115 is unavailable, so that will selection tradition
RAN 120 is used in audio call for calling appl. 235.It is used in this way, not violating when LTE-RAN 115 can be used
The configuration of VoLTE calling.Correlation function can be performed to be connected to the base station of traditional RAN 120 in MT website 110.The correlation function does not have
Have and shown in signaling diagram, and should be understood as the association of the network type (for example, 3G, 2G etc.) for traditional RAN 120
Program.
Because tradition RAN 120 can be more reliable in an uplink transmission (for example, when sip response is due to LTE-RAN 115
In uplink limited case and failure when), so network selection application program 240 traditional RAN 120 can be used for it is any
Uplink transmission.By being moved to traditional RAN120, MT website 110 can execute several behaviour based on communication standard currently in use
Make.For example, MT website 110 is only on the basis of enhanced high-speed rate packet data (eHRPD) (for example, enhanced language in 3GPP2
Sound is data-optimized (1x EV-DO)) by IMS be short message service (SMS) register and pass through 1x as voice register.Another
In a example, in 3 gpp, MT website 110 can be that SMS is registered and by wideband code division multiple access (WCDMA) as language by IMS
Sound registration.By this method, MT website 110 can be moved to traditional RAN 120 from LTE-RAN 115.It is as follows to retouch in more detail
It states, MT website is SMS registration, because the function is used to transmit information to MO website to continue audio call.
After associated with traditional RAN 120, network selection application program 240, which produces, will be transmitted to MO website
105 handover request 335.As described above, the message can be transmitted via SMS.However, if MO website 105 and MT website 110 have
There is the another way (for example, proprietary messaging system) for transmitting message between sites, then can also be used this another type of
Messaging system.In other words, important function is that the transmission of MT website 110 reaches the message of MO website 105.In the example
In, handover request 335 can be transmitted via SMS from MT website 120, and the MT website is via traditional RAN 120 by 340 turns of handover request
It is sent to MO website 105.
The network selection application program 240 of MO website 105 can receive handover request 340 from MT website 110.It should be noted that
When handover request 340 is in the form of SMS message, which can be formatted such that that the user of MO website 105 does not know
Have received message.That is, network selection application program 240 can receive handover request 340 and not from MO website 105
The function is executed in the case where any input of user.The reception of handover request 340 can indicate that calling is not to MO website 105
It cannot establish, for example, MT website 110 has received session invitation 310, but cannot be to session invitation due to limited RF situation
310 make a response, and MT website 110 has been moved into traditional RAN 120.It should be noted that considering from network perspective, can be used
Handover request 340, so that there is no pass through again paging of the tradition RAN 120 from MO website 105 to MT website 110.
MO website 105 can remain attached to LTE-RAN 115 and participate in audio call using VoLTE calling, simultaneously
MT website 110 participates in audio call using traditional RAN 120.When receiving handover request 340, MO website 105 can be matched
It is set to and audio call is pellucidly re-initiated to MT website 110.In particular, MO website 105 can again pass session invitation 345
LTE-RAN 115 is transported to, instruction calling should be placed on MT website 110.However, since MT website 110 is no longer connected to LTE-
RAN 115, thus execute be related to LTE-RAN 115, tradition RAN120, cellular core network 125 and IMS 130 call setup
Process 350 is to connect MO website 105 and MT website 110.It should again be noted that IMS 130 for VoLTE calling provide function with
Circuit-switched voice call interoperability.Once the establishment process 350 is completed, audio call 355 can be executed.
Fig. 4 is shown for executing network selection so that call session is transferred to the of 3G network 120 from LTE network 115
Two exemplary signaling charts 400.In particular, signaling diagram 400, which is related to MO website 105, also switches to biography after receiving handover request
The example of system RAN 120.Signaling diagram 400 may include the process substantially similar with signaling diagram 300, such as until by MO website
Until 105 receive handover request.In particular, can be with substantially similar manner described in the signaling diagram 300 above with reference to Fig. 3
Come execute session invitation 305,310, conversational response 315, timer 320 cannot make a response 325, selection 330 and of tradition RAN
The step of handover request 335,340.
As shown in signaling diagram 400, when the network of MO website 105 selection application program 240 receives handover request 340,
The network selection application program 240 of MO website 105 determines that MO website 105 will also select 445 tradition RAN 120.In this example,
MO website 105 is automatically moved to traditional RAN 120 when receiving handover request 340 from MT website 110.Therefore, MO website
105 is also associated with the base station of traditional RAN 120 and be connected to traditional RAN 120.When being connected to traditional RAN 120, MO
The calling appl. 235 of website 105 can determine that VoLTE calling is unavailable, and therefore use circuit-switched voice call.It exhales
The call establishment 450 for making application program 235 that tradition RAN120 can be used re-initiates audio call to MT website 110.By
LTE-RAN 120 is neither used in MO website 105 and MT website 110, therefore LTE-RAN 120 and IMS 130 do not join
With into the establishment process 450.Once the establishment process 450 is completed, audio call 455 can be executed.
Also the MO website 105 for being moved to traditional RAN 120 can provide more effective response during handling handover request,
Especially consider from network perspective.For example, processing event and by from MO website 105 to MT website 110 it is new call from
Network delay may be present during being re-routed to traditional RAN 120 in LTE-RAN 115.In another example, it is being directed to
Network delay may be present from the context that LTE-RAN 115 discharges previous calls in MT website 110.
Using the aforesaid way for solving to establish audio call failure using VoLTE by MT website 110, audio call can be still
It maintains and executes between MO website 105 and MT website 110 in a seamless manner.That is, call session can for MT website 110 or
Both MO website 105 and MT website 110 are transferred to traditional RAN 120 in the establishment process of audio call.Therefore, when voice is exhaled
When sip response successfully will cannot be transmitted to LTE-RAN115 and failure additionally, due to MT website 110 by the establishment process cried, net
Network selection application program 240 can provide a mechanism still audio call to be enable to be performed, but MT website 110 will work without
VoLTE participates in audio call.
Fig. 5 shows the first illustrative methods 500 for executing audio call by MT website 110.That is, working as MT website
When 110 and MT website 105 is realized above for function described in network selection application program 240 and calling appl. 235, side
Method 500 is from the viewpoint of MT website 110.MT website 110 can be considered as being connected to LTE- before method 500 starts
RAN 115.It will respectively refer to network arrangement 100, the website 200 of Fig. 2 and the signaling diagram 300,400 of Fig. 3 and Fig. 4 of Fig. 1
Description method 500.
In step 505, the calling appl. 235 of MT website 105 receives meeting by the downlink of LTE-RAN 115
Words invite 310.In step 510, the network selection application program 240 of MT website 105 determines whether MT website 105 can be to meeting
Words are invited and are made a response.For example, network selection application program 240 can receive the information of related network parameter, uplink can be such as used
Link transmission power.
If network selection application program 240 immediately determines that MT website 110 cannot make a response session invitation 310,
Method 500 proceeds to step 540, and the step is described in further detail below.However, if network selects application program
240 determine MT websites 110 be able to use LTE-RAN115 or otherwise can transmission response, then method 500 proceeds to
Step 515.
In step 515, the network selection application program 240 of MT website 110 starts preset timer 320.In step 520
In, calling appl. 235 responds 315 by the uplink transmission session of LTE-RAN 115.Calling appl. 235 can
Transmission session response, until success or until the duration failure of timer.In step 525, MT website
110 network selection application program 240 determines whether conversational response 315 is successfully transmitted to MO website 105.If it succeeds,
Method 500 proceeds to step 530.In step 530, MT website 110 executes audio call to MO website 105.In particular, MT
Website 110 executes audio call to MO website using VoLTE.
Back to step 525, if it is determined that the trial of transmission session response is unsuccessful, then method 500 proceeds to step
535.In step 535, the network selection application program 240 of MT website 110 determines whether timer 320 has failed.If fixed
When device 320 still running, then method 500 return to step 520.However, network selection is answered if timer 320 has failed
It can determine that LTE-RAN 115 cannot be used for VoLTE calling with program 240.Therefore, method 500 proceeds to step 540.
In step 540, the network selection application program 240 of MT website 110 selects traditional RAN120.As described above, this
It can cause to be that SMS is registered and by the 1x in 3GPP2 or by the WCDMA in 3GPP as voice registration by IMS 130.Cause
This, MT website 110 is now connected to traditional RAN 120.In step 545, the network of MT website 110 selects application program 240
Handover request 335 is transmitted for example, by SMS.In step 550, the reception of calling appl. 235 of MT website 110 is transmitted again
Information execute the call establishment of audio call to use traditional RAN 120.
After executing step 540-550, method 500 proceeds to step 530, wherein using tradition RAN by MT website 110
To execute audio call.Because traditional RAN 120 is used, audio call by MT website 110 calling appl.
235 execute as circuit-switched voice call.
Fig. 6 shows the second illustrative methods 600 for executing audio call by MO website 110.That is, working as MO website
When 105 and MT website 110 is realized above for function described in network selection application program 240 and calling appl. 235, side
Method 600 is from the viewpoint of MO website 105.MO website 110 can be considered as being connected to LTE- before method 600 starts
RAN115.The signaling diagram 300,400 of the network arrangement 100 for respectively referring to Fig. 1, the website 200 of Fig. 2 and Fig. 3 and Fig. 4 is retouched
State method 500.
In step 605, the calling appl. 235 of MO website 105 is transmitted by the uplink of LTE-RAN 115
Session invitation 305.Using LTE-RAN 115, session invitation 305 can invite for SIP.In step 610, MO website 105 is exhaled
Application program 235 is made to determine whether to have received conversational response (for example, sip response).As described in method 500, this can above
For when MT website 110 is successfully transferred conversational response 315 using the uplink of LTE-RAN 115.If call applications journey
Sequence 235 receives conversational response, then method 600 proceeds to step 615.In step 615, audio call is executed.In particular, examining
Consider these situations, the calling appl. 235 of MO website 105 is called by LTE-RAN 115 using audio call as VoLTE
To execute.
Back to step 610, if being not received by conversational response, method 600 proceeds to step 620.In step 620
In, the network selection application program 240 of MO website 105 determines whether that for example receiving switching from MT website 110 via SMS disappears
Breath 340.If not yet receiving handover request 340, method 600 returns to step 610.It should be noted that the process can continue,
Until receiving conversational response 315 or handover request 340, or when both there are no timeout periods when receiving to be over
And it calls until having stopped.
If receiving handover request 340 in step 620, method 600 proceeds to step 625.In step 625,
The network selection application program 240 of MO website 105 determines whether tradition RAN 120 will also be used by MO website 105.It should infuse
Meaning, can predefine the determination for using traditional RAN 120.In the first example, select can be can to carry out switchback by traditional RAN 120
The user's input changed.In the second example, traditional selection of RAN 120 can be set by administrator.In third example, network selection
When the dynamically determination of application program 240 will use tradition RAN 120.
If by the connection of LTE network 115 is arrived without using tradition RAN 120 and maintenance, method 600 proceeds to step
630.The branch of method 600 is related to the process described in signaling diagram 300, and wherein MO website does not switch to traditional RAN 120.
In act 630, the calling appl. 235 of MO website 105 passes through the uplink by session invitation 345 via LTE-RAN 115
Link is transmitted again pellucidly to re-initiate audio call.Then, method 600 proceeds to step 640, hereafter will be further detailed
The step carefully is described.
Back to step 625, if tradition RAN 120 will be used by MO website 105, method 600 proceeds to step
635.In step 635, the network selection application program 235 of MO website 105 selects traditional RAN 120, and executes corresponding behaviour
Make to be connected to traditional RAN 120.The branch of method 600 is related to the process described in signaling diagram 400, wherein MO website
105 switch to traditional RAN 120 to execute audio call.
In step 640, the calling appl. 235 of MO website 105 is directed to according to the current connection of MO website 105
LTE-RAN 115 or tradition RAN 120 executes call establishment.As described above, call establishment is related to MO website 105 thoroughly
Audio call is re-initiated to MT website 110 brightly.In step 645, the calling appl. 235 of MO website 105 is stood from MT
Point 110 receives conversational response.Method 600 then continues to step 615, wherein executing audio call.
It should be noted that MO website 105 can be used when having used step 630 and having maintained to arrive the connection of LTE-RAN
VoLTE calling participates in audio call, while MT website 110 participates in audio call using circuit-switched voice call.In addition, when making
It with step 635 and has used to when the connection of traditional RAN, the circuit similar to MT website 110 can be used to hand over for MO website 105
It changes audio call and participates in audio call.
Exemplary embodiment is provided for by selecting the network for being carried out audio call come diverting call session
System and method.In particular, MO website can invite MT website to carry out audio call, wherein MO website and MT website be both
It is connected to LTE-RAN.Therefore, MO website and MT website both can be used VoLTE calling and participate in audio call.For various originals
Cause, MT website possibly can not make a response invitation.Since VoLTE will be used to call and be attributed to this incapability, voice
Calling will typically fail to establish.However, the network selection application program of MT website can provide for passing for audio call selection
The function of system RAN.The handover request and be directed to that impliedly eictic word sound calling not yet fails are used for by providing to MO website
The request that audio call re-initiates can pellucidly establish audio call.
According to one embodiment, a kind of system includes be connected to long term evolution radio access network (LTE-RAN) the
One website and the second website.First website is configured as the invitation of the establishment process for audio call being transmitted to the second website
Handover request is received with from second website, which includes the instruction associated with traditional RAN of the second website.The biography
System RAN executes audio call as circuit-switched call.First stop point is configured to again transmit the invitation
To second website, the establishment process of the audio call is executed, and is executed and the second station using LTE voice (VoLTE)
The audio call of point.Second website is configured as: from the first website receive for audio call establishment process invitation, really
Fixed second website cannot use the LTE-RAN that will be transmitted to first website to the response of the invitation, connect first website
It is connected to traditional RAN, and generates handover request when being connected to tradition RAN.Handover request include second website with this
Traditional associated instruction of RAN.Second station point be configured to for the handover request to be transmitted to first website, from this
One website receives the invitation of the establishment process for audio call.Tradition RAN is deferred to execute the establishment process.Second station
Point is configured to execute the audio call with first website via tradition RAN.
It will be apparent to one skilled in the art that can be implemented with any suitable software or hardware configuration or their combination
Exemplary embodiments described above.Exemplary hardware platform for implementing exemplary embodiment may include, for example, having simultaneous
The platform based on Intel x86, Mac platform and MAC OS of the operating system of appearance, iOS, Android or other operation systems are executed
The mobile device of system.In other examples, the exemplary embodiment of method as discussed above can be presented as non-comprising being stored in
The program of code line in transitory computer readable storage medium, in compiling, described program can be in processor or microprocessor
Upper execution.
To those skilled in the art it is evident that, can be before not departing from spirit or scope of the invention
It puts and the present invention is carry out various modifications.Therefore, the invention is intended to cover modification and variations of the invention, but premise
It is these modifications and variations in the range of appended claims and its equivalent form.
Claims (18)
1. a kind of method that the network for audio call selects, comprising:
The invitation that audio call is added is transmitted to by the second website by the first radio access network RAN by the first website；
The invitation is received by second website；
Response to the invitation is generated by second website；
Determine that the response cannot be successfully transmitted to first website by second website；
It is associated with the 2nd RAN by second website；
It is generated by second website associated with the 2nd RAN for instruction second website of first website
Message；
The message is transmitted to first website by second website；
Determine that first website is to remain connected to the first RAN or to be connected to described by first website
Two RAN execute the audio call；
When determination will execute the audio call by the 2nd RAN, described second is connected to by first website
RAN, wherein executing institute's predicate by the first RAN when determining that first website will remain connected to a RAN
Sound calling；
Transmit the invitation that the audio call is added again by first website；
The invitation is received by the 2nd RAN by second website；And
The audio call is established between first website and second website.
2. according to the method described in claim 1, wherein the first stop point uses in 2nd RAN of the first RAN or described
One of participate in the audio call, and second website participates in the audio call using the 2nd RAN.
3. according to the method described in claim 1, wherein first RAN is long term evolution radio access network LTE-RAN
Or one of WiFi network.
4. according to the method described in claim 1, wherein second RAN holds audio call as circuit-switched call
Row.
5. a kind of method that the network for audio call selects, comprising:
At the first website:
The invitation of the establishment process for audio call is received from the second website, it is wireless that second website is connected to long term evolution
It is electrically accessed network LTE-RAN, first website is configured with LTE voice VoLTE and executes the audio call；
Determine that first website cannot use the LTE-RAN that will be transmitted to second website to the response of the invitation,
The wherein determination includes:
Start preset timer when receiving the invitation；And
When failed transmission response, determine that first website cannot transmit the response when preset timer failure；
First website is connected to traditional RAN, wherein the tradition RAN holds audio call as circuit-switched call
Row；
Generate handover request when being connected to the tradition RAN, the handover request include first website with the biography
The system associated instruction of RAN；
The handover request is transmitted to second website；
The invitation of the establishment process for audio call is received from second website, wherein deferring to the tradition RAN
Execute the establishment process；And
The audio call with second website is executed via the tradition RAN.
6. according to the method described in claim 5, wherein the handover request includes first website from the LTE-RAN
Switch to the instruction of the tradition RAN.
7. according to the method described in claim 5, wherein the tradition RAN is one of 2G RAN and 3G RAN.
8. according to the method described in claim 5, wherein the handover request via the tradition RAN short message service SMS
Transmission.
9. a kind of method that the network for audio call selects, comprising:
At the first website:
The invitation of establishment process for audio call is transmitted to the second website, first website be connected to long term evolution without
Line is electrically accessed network LTE-RAN, and first website is configured with LTE voice VoLTE and executes the audio call；
Handover request is received from second website, the handover request includes that second website is associated with traditional RAN
Instruction, wherein the tradition RAN executes audio call as circuit-switched call；
Determine that first website is to remain connected to the LTE-RAN to execute the audio call or to be connected to institute
Traditional RAN is stated to execute the audio call；
It is connected to the tradition RAN when determination will execute the audio call by the tradition RAN, wherein described in the determination
When first website will remain connected to the LTE-RAN, by first website using the audio call as VoLTE call Lai
It executes；
The invitation is transmitted to second website again；
Execute the establishment process of the audio call；And
Execute the audio call with second website.
10. according to the method described in claim 9, further include:
Determine that first website is to remain attached to the LTE-RAN to execute the audio call or will connect
To the tradition RAN to execute the audio call.
11. according to the method described in claim 9, further include:
When determination will execute the audio call by the tradition RAN, it is connected to the tradition RAN.
12. according to the method described in claim 10, wherein when determining that first website will remain attached to the LTE-
When RAN, first website calls to execute using the audio call as VoLTE.
13. according to the method described in claim 9, wherein when first website is connected to the LTE-RAN, the invitation
It is that Session initiation Protocol SIP is invited.
14. being invited described in transmission again according to the method described in claim 9, wherein executing without user interaction
Please.
15. according to the method described in claim 9, wherein the tradition RAN is one of 2G network and 3G network.
16. according to the method described in claim 9, wherein the handover request further indicates that second website has received
The invitation.
17. according to the method described in claim 9, wherein the case where not paging second website by the tradition RAN
Lower execution the described of invitation is transmitted again.
18. a kind of system that the network for audio call selects, comprising:
It is connected to the first website of long term evolution radio access network LTE-RAN；And
Second website,
Wherein, first website is configured as:
The invitation of establishment process for audio call is transmitted to the second website；
Handover request is received from second website, the handover request includes that second website is associated with traditional RAN
Instruction, wherein the tradition RAN executes audio call as circuit-switched call；
The invitation is transmitted to second website again；
Execute the establishment process of the audio call；And
The audio call with second website is executed using LTE voice VoLTE；And
Wherein, second website is configured as:
The invitation of the establishment process for audio call is received from the first website；
Determine that second website cannot use the LTE-RAN that will be transmitted to first website to the response of the invitation；
The handover request for being used for first website is generated when being connected to the tradition RAN, the handover request includes described
The instruction associated with the tradition RAN of second website；
The handover request is transmitted to first website；
The invitation of the establishment process for audio call is received from first website, wherein deferring to the tradition RAN
Execute the establishment process；And
The audio call with first website is executed via the tradition RAN,
Wherein, first website is also configured to
Determine that first website is to remain connected to the LTE-RAN to execute the audio call or to be connected to institute
Traditional RAN is stated to execute the audio call；And
It is connected to the tradition RAN when determination will execute the audio call by the tradition RAN, wherein described in the determination
When first website will remain connected to the LTE-RAN, by first website using the audio call as VoLTE call Lai
It executes.
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| US20150350971A1 (en) | 2015-12-03 |
| JP2015228649A (en) | 2015-12-17 |
| DE102015209240B4 (en) | 2020-03-05 |
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| US9538430B2 (en) | 2017-01-03 |
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